Round 6: 1230 AD to End - Until Next Time
Well, the round started off slowly. I didn't want to use spies to steal techs since I was worried that it would be risky and that it would hurt my future development late game when I would need to research space techs before everyone else to get a head start on the parts (and also that building spy buildings means I have less time to build factories, etc.). That might have been my mistake. In the future, I'm replaying this game from the point where I could bribe peter out of AC's war and see if the extra cities that I would have gotten would help me gain ground in tech.
I switched civics, and went back to slavery (to whip infrastructure) and bureaucracy (to get Peter pleased with me).
After researching steam power, I got some good news concerning the location of coal.
My research this round, IIRC, went Steam Power -> Corporation -> Assembly Line -> Biology.
A large part of this round was rectifying the economic situation. I whipped courthouses, harbors, custom houses, and stock exchanges in many cities. Levees were also a priority in my riverside cities. However, in some cases (such as with Washington below) I knew that it was best to simply let the city produce the courthouse manually. I find that whipping is best with high food but low production cities.
Speaking of Washington, I had fun trying to maneuver the workers to build the maximum amount of watermills possible. You can only build watermills on one side of a river, so the way to have more watermills is to put the watermills on tiles that only have 1 riverside, so you know where th watermill will go. (Sisiutil has a pretty good article on that in one of his strategy guides.) If you have a tile surrounded by a river on at least 2 sides, the game puts the watermill in a random place.
I got some good news when I popped gold in Boston. I would have prefered another one of the minerals, but I don't scoff at free resources.
My plan of running a Golden Age failed when I got a
second Great Scientist.

I sent one to build an academy in Hastings to the south, which was currently my second-best research city. The other one I settled in the capital for 1 hammer and 6 beakers (before multipliers).
I researched Assembly Line with the hope that other civs wouldn't have it by the time I resarched it. The production boost from AL was nothing to scoff at, either.
When I finished Assembly Line, I was pleased to see that many lacked it.
Trading was, thus, able to commence.
And I was FINALLY able to switch to Emancipation! I was suffering 4-5 unhappiness in each city because I didn't run that civic! I don't think I've ever had Emancipation unhappiness this bad.
With the addition of railroads, I took all of my workers and put them in groups of 3 (I had 15 workers in all - so 5 groups of 3 workers each) so that they could railroad grassland and plains hills in 1 turn. When buiding railroads, I always aim to railroad the hills, quarries, and lumbermills first to benefit from the +1 production on the tile.
I researched to Biology, hoping to trade it with sevearl other civs. Failing that, the growth boost to my cities would be important anyway.
I finished Biology and checked the tech screen. I was worried that everyone would get the tech before I did, thus rendering it useless for trade.
But Zara and Joao still hadn't researched Biology!

With my strategy of researching techs the other civs lacked, I got Physics and Combustion with Joao II and Zara, respectively.
Meanwhile, Washington now completed the Ironworks. I think this city fit the location quite well due to the large amount of riverside tiles and ample food resources.
Now the second-largest goof-up for me this game. An AP resolution came up which said "sign defensive pact with all members." I thought this meant that I would have defensive pacts with the other members, which was obviously what I wanted! So I ran the resolution and ...

I should have checked the AP Guides here on the forums, since I had no idea that this meant all other members would sign pacts with each other! This basically put a war with Hannibal out of the question. I had about 6 transports ready and most of my army from the Augustus Caesar war ready by the time I declared the game to be over.
But, y'know, even if I
did raze Carthage (which was defended by about 15 land units and 15 air units), Peter and Joao II were miles ahead in the space race. While Joao II didn't have that much production to pull off a space race win in a timely manner (coastal cities), Peter did.
The only realistic way I could win this game was by building the internet, but naturally Peter and Joao II both beat me to Computers, and Peter built the internet.

He would have launched his spaceship at around 1750 AD, with nuclear weapons to protect his capital from destruction.
The tech situation right when I was about to research plastics. You can see that I was really behind anyway.
And after Peter built the Manhattan Project, I kind of lost hope in this game. Hannibal was going to win by culture in about 40 turns, followed by Peter's space race. FYI, Peter and Joao II both built Apollo at around 1500 AD.
So ... yeah, time to chalk this up as a loss. I got basically out-teched and out-muscled by Peter. Who wants to see ALC 27 Take 2 with Churchill, on a map similar to this (Big and Small, etc.)? More discussion to follow in the ALC bullpen I guess.